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add better 1D support for gif images

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Instead of showing a scaled, single line of the GIF: map the full gif to the strip
This commit is contained in:
Damian Schneider
2025-11-06 14:55:26 +01:00
parent b60313e1f8
commit 01c84b0140
1 changed files with 19 additions and 7 deletions
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26
wled00/image_loader.cpp
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@@ -52,13 +52,25 @@ void screenClearCallback(void) {
void updateScreenCallback(void) {}
void drawPixelCallback(int16_t x, int16_t y, uint8_t red, uint8_t green, uint8_t blue) {
// simple nearest-neighbor scaling
int16_t outY = y * activeSeg->height() / gifHeight;
int16_t outX = x * activeSeg->width() / gifWidth;
// set multiple pixels if upscaling
for (int16_t i = 0; i < (activeSeg->width()+(gifWidth-1)) / gifWidth; i++) {
for (int16_t j = 0; j < (activeSeg->height()+(gifHeight-1)) / gifHeight; j++) {
activeSeg->setPixelColorXY(outX + i, outY + j, red, green, blue);
if (activeSeg->height() == 1) {
// 1D strip: load pixel-by-pixel left to right, top to bottom (0/0 = top-left in gifs), scale if needed
int totalImgPix = (int)gifWidth * gifHeight;
int stripLen = activeSeg->width();
if (totalImgPix - stripLen == 1) totalImgPix--; // handle off-by-one: skip last pixel instead of first
int start = ((int)y * gifWidth + (int)x) * stripLen / totalImgPix; // simple nearest-neighbor scaling
int end = (((int)y * gifWidth + (int)x+1) * stripLen + totalImgPix-1) / totalImgPix;
for (int i = start; i < end; i++) {
activeSeg->setPixelColor(i, red, green, blue);
}
} else {
// simple nearest-neighbor scaling
int outY = (int)y * activeSeg->height() / gifHeight;
int outX = (int)x * activeSeg->width() / gifWidth;
// set multiple pixels if upscaling
for (int i = 0; i < (activeSeg->width()+(gifWidth-1)) / gifWidth; i++) {
for (int j = 0; j < (activeSeg->height()+(gifHeight-1)) / gifHeight; j++) {
activeSeg->setPixelColorXY(outX + i, outY + j, red, green, blue);
}
}
}
}